不同物性对椭球形颗粒在移动床中流动特性影响的.pdfVIP

第 31 卷 第 5 期 中 国 电 机 工 程 学 报 Vol.31 No.5 Feb.15, 2011 68 2011 年 2 月 15 日 Proceedings of the CSEE ©2011 Chin.Soc.for Elec.Eng. 0258-8013 (2011) 05-0068-08 TK 16 A 470 10 文章编号： 中图分类号： 文献标志码： 学科分类号： ⋅ 不同物性对椭球形颗粒在移动床中 流动特性影响的模拟研究 陶贺，金保昇，钟文琪 ( 东南大学能源与环境学院，江苏省 南京市 210096) Effect of Particle Properties on the Flow Behaviors of Ellipsoidal Particles in the Moving Bed TAO He, JIN Baosheng, ZHONG Wenqi (School of Energy Environment, Southeast University, Nanjing 210096, Jiangsu Province China) ABSTRACT: Discrete element model (DEM) was developed 起的球元构成，建立了椭球形颗粒的碰撞机制，详细分析了 to simulate the ellipsoidal particles flowing in the moving bed. 其运动过程中的受力情况，主要是碰撞力和重力，并通过实 The ellipsoidal particles was described by three overlapping 验验证了模型的正确性。探讨不同物性颗粒在移动床内的流 sphere. Contact force and gravity force were considered when 动特性，分析颗粒物性对流型、空隙率分布以及颗粒分离情 establishing the models, and the model was validated by the 况的影响。结果表明，滑动摩擦系数越小，颗粒流动越接近 experiment results. In addition, flowing characteristic of 整体流，滑动摩擦系数越大，颗粒流动越接近漏斗流，且滑 particles in the moving bed was studied. The result shows that 动摩擦系数越大，空隙率的波动范围越大，滑动摩擦系数越 the flow mode is closer to the mass flow with the slide friction 小，空隙率分布越均匀。滚动摩擦系数和弹性恢复系数对流 coefficient decreasing. And the voidage fluctuation range is 型和空隙率的影响都很小。在二元混合物中，颗粒直径比越 greater as the slide friction coefficient increasing. Also, the 大，空隙率越小。不同尺寸颗粒混合物会导致颗粒分离，在 influence of rolling friction coefficient and restitution 下料时，颗粒直径比越大，细颗粒含量越少，但在物料卸出 coefficient on the flo